[Bug 112018] I7-8700 onboard HDMI port does not support 4K resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112018

--- Comment #6 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to jian-hong from comment #5)
> > Also please attach a dump of
> > /sys/kernel/debug/dri/0/i915_vbt
> 
> The dump is as the attachment.

Sadly I don't see anything obvious we could use as a hint to ignore the dual
mode adapter's limit. I was hoping the VBT would declare the port as an
internal HDMI port (which it does) *and* it would declare a TMDS clock limit
>165MHz (which sadly it does not) :(

Well, it does say the limit is 0 ie. "platform max" but that's not a very
strong hint to indicate that someone actually tested the thing with a >165MHz
clock. Could be just they were too lazy to put in any real number and so left
it at 0. So I'm not keen on including that as a valid value in such a
heuristic. Feels like that could backfire on us.

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